<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=`, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>多类名的使用方式</title>
    <style>
        .red {
            color:  red;
        }
        .font35 {
            font-size: 35px;
        }
    </style>
</head>
<body>
    <div class="red font35">刘德华</div>
</body>
</html>